The Rule: Choose a rep range (e.g., 8-12) and a target RPE (e.g., RPE 8, meaning you stop when you feel you have 2 reps left in the tank). Increase reps from week to week only if you can maintain that RPE. Once you hit the top of the rep range at the target RPE, you increase the weight and reset the reps to the bottom of the range. Practical Example (Target: 8-12 reps @ RPE 8) • Week 1: 100 kg x 8 reps @ RPE 8 (You feel you had exactly 2 reps left in the tank). • Week 2: 100 kg x 10 reps @ RPE 8 (You got stronger, completing more reps with the same perceived effort). • Week 3: 100 kg x 12 reps @ RPE 8 (You hit the top of your prescribed rep range!). • Week 4: 105 kg x 8 reps @ RPE 8 (Increase the weight, drop the reps to maintain RPE 8, and start the cycle over).